RCC JACKING PIPE

Pipe ramming (also called pipe jacking) is a groove less method for attaching steel pipes and casings.. Distances of 30 m (150 feet) or more and over 1,500 mm (60 inches)Although diameter is common, this method can be used for much longer and larger installations. 

This method helps in the installation of pipes and casings under railway lines and roads where other groove less methods can cause land subsidence or uplift. This method can be used for vertical installations, but most installations are horizontal installations.

                                 

The main difference between the pipe ramming method and the pipe jacking method is that the pipe ramming uses a percussion and does not have a navigation system, whereas the pipe jacking uses a hydraulic jack and has an active navigation system. The pipe ramming method is good for short distances and applications that do not require very tight directional control, such as cable installations.

The method uses pneumatic percussive wind to drive pipes to the ground. The leading edge of the pipe is almost always open and is usually closed only when small pipes are installed. 

The shape allows a small overcut (to reduce friction between the pipe and the soil and improve the load position on the pipe) and directs the soil to the inside of the pipe instead of compacting it out of the pipe. These objectives are usually achieved by connecting the pipe to a soil break or special band.

Further reduction of friction is usually achieved by lubrication, and various types of bentonite and / or polymers can be used for this purpose (such as horizontal boring). After placing the entire pipe it is possible to remove the impure from the pipe (small installation).

 If the pipe containing the spoil becomes too heavy before the installation is complete, the ramming can be interrupted and the pipe cleaned (longer installations).Spills can be removed by auger, compressed air or water jetting.

Recent research on ventilated pipe ramming installations has allowed the development of pipe ramming-specific models for dynamic model parameters to simulate stable soil resistance and the drive ability of rammed pipes. This procedure can be used to estimate the feasibility of pipe ramming installations.

Pipe jacking

The pipe jacking method is based on the principle of driving the launch (or reception) from the launch shaft towards the shaft.

The alignment is controlled by a laser beam from the launching shaft, which guides the machine through the axis of the tunnel. The laser is a basic control device and it works with an inclinometer and a gyroscope. The laser beam is directed at the top of the machine cutter, and its location is controlled in real time by the surface navigation system.

How does pipe jacking work?

Pipe jacking method involves the installing of a pipe (prefabricated) through the ground. ... During the implementation of the process, the hydraulic jack makes use of thrust power to move the pipe forward into the ground. The force of the jacks are retracted after installation of each pipe.